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Folks,We are working on a solid state replacement for GZ34 that is more sophisticated than current options and suggested circuits. We intend to accurately mirror the original valve's characteristics..
There are a couple of questions for GZ34 experts.
Please refer to GZ34 datasheet at http://www.drtube.com/datasheets/gz34-philips1958.pdf. Page 5 and 6 refer to 2 sets of curves - one from 1954 and one from 1958. The older version is a more lossy tube which will run much hotter in similar applications. Which curve is more desirable to simulate?What functional features and characteristics will be good to have in this device?
Your input is greatly appreciated."
Edits: 02/19/14Follow Ups:
Slow warm-up and the characteristic voltage drop of the GZ34/5AR4 is important. You can't make the rectifier too stout, it need a little drop or sag. A Fender amps that uses two 6L6GC's sound completely different whether the amps has solid-state or GZ34 recitification.This is one of the big components of the Holy blackface AB763 circuit (like BF Super Reverb). Versus the tone from the solid-state rectified Bandmaster AB763 circuit.
Edits: 02/19/14
with 'adjustable' sag.
Additional tone control, as it were? ;-)
that New Sensor has just released a Mullard GZ-34
IMHO, it's greatest attribute is the 30 second warmup which allows HV to be delayed until power tubes are warmed up. That will be hard (not impossible) to duplicate with SS.
Thanks Steve O and AlphaAi for affirming that we are on the right track.
Slow warm up that mimics actual GZ34 is already a part of our design. There will also be some kind of visual indication, maybe a dual color LED. Good heat sink is also planned.
"Steve O - Another nice feature above and beyond a true thermionic emitter would be a power loss detector such that the cold warm up sequence is repeated if there's a momentary power loss. "
Power Loss detector would be worth adding on too.
One characteristic I'd like to see would be a true simulation of a 5AR4 warmup characteristic. i.e. Zero conductance @ initial application of HV with a delay of about 5 sec then a slow ramp up of conductance over about a 15 sec period to a final conductance that simulates a fully warmed up 5AR4. Another nice feature above and beyond a true thermionic emitter would be a power loss detector such that the cold warm up sequence is repeated if there's a momentary power loss.
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